Cape Town, South Africa

Cape Peninsula University of Technology
Cape Town, South Africa

Cape Peninsula University of Technology, a university in Cape Town, South Africa, is the only university of Technology in the Western Cape province, and is also the largest university in the province, with over 32,000 students. Wikipedia.

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A rare and surprising encounter with humpback whales delighted marine biologists, who were puzzled to spot them in a gathering of impressive size. Research cruises in the southwestern region of South Africa stumbled across these magnificent creatures huddling in large groups of up to 200 to hunt and feed together. The sightings occurred in the Benguela Upwelling System, a stream of oceanic currents that flow from St. Helena Bay all the way to Cape Point. Equally remarkable was discovering their presence in these waters off-season. Several study expeditions reported chance meetings with humpback whales in October and November, when the creatures should have already started their migration to colder regions. This time of the year typically finds the whales embarked on a journey to Antarctica, where they go to find food and spend the summer after giving birth and nursing their calves in warmer tropical waters. The unusual behavior prompted an ample research into the feeding habits of humpback whales, which revealed a few unexpected facts about their nature and way of life. The findings were published in the journal PLOS One. Humpback whales have been consistently described as solitary animals, which enjoy spending most of their days alone and seldom seek the company of others. Scientific literature reports rare exceptions of the animals gathering in arctic waters to feed in groups but of significantly smaller sizes. In the past, researchers marveled at seeing the whales come together in congregations of no more than 15. Now, they are utterly bewildered to find them rounding up in "supergroups" of 20 to 200 animals. According to study author Ken Findlay, from the Cape Peninsula University of Technology in South Africa, this type of whale social conduct is fairly unprecedented. "No such dense feeding aggregations have been reported elsewhere in low or mid latitudes during Southern Hemisphere humpback whale migrations," Findlay explains. Researchers have had the opportunity to observe this recent peculiar behavior on three separate occasions, during study trips along the Benguela Upwelling System in 2011, 2014, and 2015. These sightings contradict what was previously known of these majestic creatures, suggesting they have a more gregarious nature than originally thought. One theory is the abundance of prey makes the Benguela System particularly appealing. The study indicates a high prevalence of mantis shrimp in the area, which humpback whales have been found to favor. Another possible cause for the whales amassing is the recent spike in their numbers, which could lead them to explore unfamiliar hunting territories to avoid exhausting their usual food supplies. A third explanation could be the animals, whose populations have replenished over the past 20 years, are now reverting to an older hunting strategy. After a century of absence, the whales could be returning to their former feeding grounds due to the recent massive increase in their numbers. "For the last few decades, suddenly they seem to have overcome some threshold and have begun to increase very fast," said Gísli Vikingsson, from the Marine and Freshwater Research Institute in Iceland. Researchers are also considering the possibility that humpback whales have been habitually spending their summer in Benguela unbeknown to us. Findlay suggests this could have been happening all along in less frequented areas, where it would be difficult to observe. © 2017 Tech Times, All rights reserved. Do not reproduce without permission.

John I.,Cape Peninsula University of Technology
European Journal of Physics | Year: 2017

This is the first part of a broader study, exploring the contextual variations of the responses of 149 first year (non-physics major) university students at two South African universities in Cape Town. The data analysis was done in terms of the (i) forced choice responses (FCR), (ii) free written responses and (iii) personal interviews. This paper presents the development of the instrument (aspects of circuits questionnaire, or ACQ) used in the exploratory study and the results obtained from the FCR analysis of 60 students. The results showed that the student responses are triggered by the context framed by the questions and the results obtained from investigations using light bulbs cannot be generalised and may be reinterpreted. © 2016 IOP Publishing Ltd.

Makinde O.D.,Cape Peninsula University of Technology | Aziz A.,Gonzaga University
International Journal of Thermal Sciences | Year: 2011

The boundary layer flow induced in a nanofluid due to a linearly stretching sheet is studied numerically. The transport equations include the effects of Brownian motion and thermophoresis. Unlike the commonly employed thermal conditions of constant temperature or constant heat flux, the present study uses a convective heating boundary condition. The solutions for the temperature and nanoparticle concentration distributions depend on five parameters, Prandtl number Pr, Lewis number Le, the Brownian motion parameter Nb, the thermophoresis parameter Nt, and convection Biot number Bi. Numerical results are presented both in tabular and graphical forms illustrating the effects of these parameters on thermal and concentration boundary layers. The thermal boundary layer thickens with a rise in the local temperature as the Brownian motion, thermophoresis, and convective heating each intensify. The effect of Lewis number on the temperature distribution is minimal. With the other parameters fixed, the local concentration of nanoparticles increases as the convection Biot number increases but decreases as the Lewis number increases. For fixed Pr, Le, and Bi, the reduced Nusselt number decreases but the reduced Sherwood number increases as the Brownian motion and thermophoresis effects become stronger. © 2011 Elsevier Masson SAS. All rights reserved.

This paper examined the hydromagnetic mixed convection stagnation point flow towards a vertical plate embedded in a highly porous medium with radiation and internal heat generation. The governing boundary layer equations are formulated and transformed into a set of ordinary differential equations using a local similarity approach and then solved numerically by shooting iteration technique together with Runge-Kutta sixth-order integration scheme. A representative set of numerical results are displayed graphically and discussed quantitatively to show some interesting aspects of the pertinent parameters on the dimensionless axial velocity, temperature and the concentration profiles, local skin friction, local Nusselt number and local Sherwood number, the rate of heat and mass transfer. Good agreement is found between the numerical results of the present paper with the earlier published works under some special cases. © Springer Science+Business Media B.V. 2011.

Oguntibeju O.O.,Cape Peninsula University of Technology
HIV/AIDS - Research and Palliative Care | Year: 2012

The development of antiretroviral drugs has significantly changed the perception of HIV/AIDS from a very fatal to a chronic and potentially manageable disease, and the avail-ability and administration of antiretroviral therapy (ART) has significantly reduced mortality and morbidity associated with HIV and AIDS. There is a relationship between ART and quality of life of people living with HIV and AIDS, and several studies have reported a strong positive association between ART and improved quality of life in different domains among people liv-ing with HIV and AIDS in both developed and developing countries. However, a few studies have reported on the negative effects of ART, which directly or indirectly relate to the quality of life and longevity of HIV-infected persons. In this review, the effects and benefits of ART on people living with HIV and AIDS based on studies done in developed and developing countries is examined. © 2012 Oguntibeju publisher and licensee Dove Medical Press Ltd.

Okoro H.K.,Cape Peninsula University of Technology
Reviews of Environmental Contamination and Toxicology | Year: 2011

Organotin compounds (OTCs) are organic derivatives of tin (Sn 4+) and are characterized by the presence of covalent bonds between three carbon atoms and a tin atom. The organotins are designated as mono-, di-, tri-, or tetra-organotin compounds and have the general formula (n-C 4H 9), Sn-X, where X is an anion or a group linked covalently through a hetero-atom (Dubey and Roy 2003; Okoro et al. 2011). Organotin pollution in the aquatic environment is of global concern; two triorganotin compound groups, the tributyltins and triphenyltins, are toxic to aquatic life (Fent 1996) and are used worldwide not only as biocides in antifouling paints but also as preserving agents for wood and timber, and as agricultural fungicides. These uses result in direct release to water, with consequential uptake and accumulation in aquatic fauna (Harino et al. 2000). © 2011 Springer Science+Business Media, LLC.

The present paper is concerned with the analysis of inherent irreversibility in hydromagnetic boundary layer flow of variable viscosity fluid over a semi-infinite flat plate under the influence of thermal radiation and Newtonian heating. Using local similarity solution technique and shooting quadrature, the velocity and temperature profiles are obtained numerically and utilized to compute the entropy generation number. The effects of magnetic field parameter, Brinkmann number, the Prandtl number, variable viscosity parameter, radiation parameter and local Biot number on the fluid velocity profiles, temperature profiles, local skin friction and local Nusselt number are presented. The influences of the same parameters and the dimensionless group parameter on the entropy generation rate in the flow regime and Bejan number are calculated, depicted graphically and discussed quantitatively. It is observed that the peak of entropy generation rate is attained within the boundary layer region and plate surface act as a strong source of entropy generation and heat transfer irreversibility. © 2011 by the authors.

Makinde O.D.,Cape Peninsula University of Technology
International Journal of Numerical Methods for Heat and Fluid Flow | Year: 2013

Purpose - The purpose of this paper is to investigate the combined effects of viscous dissipation and Newtonian heating on boundary-layer flow over a flat plate for three types of water-based nanofluids containing metallic or nonmetallic nanoparticles such as copper (Cu), alumina (Al2O 3), and titania (TiO2) for a range of nanoparticle volume fractions. Design/methodology/approach - The governing partial differential equations are transformed into ordinary differential equations using a similarity transformation, before being solved numerically by a Runge-Kutta-Fehlberg method with shooting technique. Findings - It is found that the heat transfer rate at the plate surface increases with increasing nanoparticle volume fraction and Biot number, while it decreases with the Brinkmann number. Moreover, the heat transfer rate at the plate surface with Cu-water nanofluid is higher than that of Al2O3-water and TiO2-water nanofluids. Practical implications - The heat transfer enhancement performances presented by nanofluids have led to innovative way of improving the thermal conductivities of working media in engineering and industries. This work provides a very useful source of information for researchers on this subject. Originality/value - This paper illustrates the combined effects of viscous dissipation and Newtonian heating on boundary-layer flow of nanofluids past a flat plate. © 2013 Emerald Group Publishing Limited. All rights reserved.

Cronje J.C.,Cape Peninsula University of Technology
Computers and Education | Year: 2011

This article reflects on the cross-cultural communicative experiences of professors from South Africa and students from Sudan, during a two-year Internet-supported Masters' course in Computers in Education. Four of Hofstede's cultural dimensions were considered as categories of interpretation. The purpose of the research was to determine the extent to which Hofstede's static quantitative, research could be used as a basis for an essentially qualitative dynamic interpretation. While Hofstede's work focuses on cultural differences, this article tries to uncover what commonalities were constructed in the process. It was found that in this case, dimensions such as power distance and uncertainty avoidance tended to amplify each other, while together they resulted in a movement away from individualism towards collectivism. Accommodating across cultures did not mean that one should move into the other culture. Three elements seem to play a role when cultures meet: Reduction of communicative uncertainty, construction of shared meaning, and appropriate use of technology. More research should be conducted to uncover the elements that are common to cultures because emphasising commonality seems more useful than trying to overcome differences. © 2010 Elsevier Ltd. All rights reserved.

Cape Peninsula University of Technology, Swedish Institute for Food and Biotechnology | Date: 2013-06-27

A fluid visualization and characterisation system includes a measuring section with a housing defining a fluid flow path for fluid flow. The measuring section includes one or more transducers to emit ultrasonic signals into the fluid flow, and at least one receiver to receive reflections of the ultrasonic signal from reflectors in the fluid flow. The system includes a memory for storing data and a processor operatively connected to the memory. The processor comprises several modules. A velocity estimating module is configured to apply one or more velocity estimation algorithms to received reflections of the ultrasonic signal, or data indicative thereof, to determine a velocity profile of the fluid flow. A deconvolution module is configured to apply a deconvolution algorithm at least to the determined velocity profile to determine a true velocity profile of the fluid flow. A fluid visualization and characterisation module is configured to determine characteristics of the fluid and/or fluid flow in by using the determined velocity profile and/or the true velocity profile.

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